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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da480d6e2d9ba008bf61d759f9f1b2f0453fd9b728f9fb8d1ae0c208a43e7115' 
  AND token = 'H86ARlfmO7ZGeTV0bH7yrh97D54D6WUBPqzmhzGUQ+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}